I couldn't finish my group ride tonight because of the heat (95+). Got about half way through and then just got dizzy, etc. The group leader was great about helping me and arranging for someone to come pick me up, but I felt so embarrassed that I couldn't finish.
I drank lots of water before the ride, had some Clif Shot blocks, drank water on the ride, etc.
How do you all prepare for rides in extreme heat?